Engine piston



FIG. 1 is an isometric view of a first engine piston.

FIG. 2 is a top view thereof.

FIG. 3 is a bottom view thereof.

FIG. 4 is a front view thereof, which is the same as a rear view thereof; and,

FIG. 5 is a right side view thereof, which is the same as a left side view thereof.

The broken lines are for purposes of illustrating portions of the engine piston that form no part of the claimed design. 

CLAIM The ornamental design for an engine piston, as shown and described. 